Mr. W. H. Benson on some new species of Helix. 105 



the same fungus, and creeping actively over the surrounding 

 moist rocks. 



3. Helix petrohia, nobis, n. s. 



Testa umbilicata, depressa, pallida cornea, diaphana, minime nitida, 

 utriuque oblique plicata, plicis subdistantibus, iuaequalibus, iu- 

 terstitiis sub lente argute longitudinaliter striatis ; spira vix elevata, 

 sutura leviter impressa ; anfractibus 4^-5, superne convexiusculis, 

 lente crescentibus, ultimo supra obtuse angulato, subtus couvexiori, 

 circa umbilicum angulato-compresso ; apertura compresso-lunata, 

 altiori quam lata, infra subangulata, obliqua ; peristomate simplici 

 acuto, niargine dextro superne arcuato, columellari tenui, verticali, 

 breviter reflexo. 



Diam. major oj-, minor A\, axis 3 mill. 



Hab. sub lapidibus, prope High Coustantia, P. B. S. 



More widely umbilicate than the preceding species, and with 

 equally oblique plicje, but differing altogether from it, and the 

 other described South-African species, in form, ratio of the 

 whorls, and in the configuration of the aperture. I got a single 

 specimen alive, in December, under a stone at the side of the 

 road leading from High Constantia towards the gorge by which 

 access is gained to Hout Bay valley. 



4. Helix Sabuletorum, nobis, n. s. 



Testa sub-late umbilicata, orbiculato-depressa, utrinque confertissime 

 striata, plicisque arcuatis distantioribus omata, non nitente, pallide 

 cornea ; spira convexiuscula, sutura profunda, apice obtuso ; an- 

 fractibus 4\-5 lente crescentibus, convexis, ultimo rotundato, 

 subtus valde conrexo ; umbilico latiusculo, interdum oranes an- 

 fractus exhibente, profundo ; apertura lunato-rotundata vix obliqua ; 

 peristomate simplici, marginibus conniventibus, columellari bre- 

 viter subreflexo. 



Diam. major A\, minor 4, axis 2 mill. 



Hab. ad Hout Bay ; Strand non procul ab vico Somerset ; et ad Kalk 

 Bay, P. B. S., in arenosis, prope littora maris. 



This shell might, on account of its similar size, and the more 

 prominent features of its sculpture, easily be mistaken for H. 

 rariplicata, nobis, by a cursory observer. It differs in its more 

 depressed spii-e^ wider umbilicus, more closely wound whorls, 

 which are in greater number, and in the delicate striae between 

 the plicse, which are more regular and distant, and never deficient 

 in the last whorl. In some specimens the umbilicus is wider 

 than in others, plainly revealing the whole of the whorls in its 

 interior. It appears to approach H. rivularis, Krauss, in some 

 respects, but is more widely umbilicate, has a greater number of 

 whorls, with a deeper suture, and differs in its mode of sculp- 

 ture. 



